Yep. As a result of the replies to my mention of the monsters i have just now submitted a request to my Inner West Council to dig the damn things up. With a suggestion they also contact the railway as some are on the railway side of the park's boundary fence. Thanks for the get-off-your-ass nudge, gang. Done.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”